text: Neuropeptides are extremely ancient and highly diverse chemical messengers. Placozoans such as Trichoplax, extremely basal animals which do not possess neurons, use peptides for cell-to-cell communication in a way similar to the neuropeptides of higher animals.
  Due to their modulatory and diffusive nature, neuropeptides can act on multiple time and spatial scales. Below are some examples of neuropeptide actions: